SysPanel projects list lacks error handling if underlying service unavailable

[Devin Carlen]

Failures of the underlying service should be handled more gracefully. For instance, trying to fetch images when Glance is unavailable results in a notification that says "Error: Unable to retrieve image list.".

When fetching projects and Keystone is unavailable, a 500 is raised and the stack trace contains:

"Authorization Failed: Unable to communicate with identity service: Unable to find the server at [hostname]. (HTTP 400)"

[Gabriel Hurley (gabriel-hurley)]

Keystoneclient raises an AuthorizationFailure when Keystone is unavailable. That exception doesn't inherit from the base keystone exception class and thus wasn't caught. Simple fix.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/6069

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/6069
Committed: http://github.com/openstack/horizon/commit/289fc72168767c1bc0d1d4727268f17d2343a66a
Submitter: Jenkins
Branch: master

commit 289fc72168767c1bc0d1d4727268f17d2343a66a
Author: Gabriel Hurley <email address hidden>
Date: Mon Apr 2 00:15:36 2012 -0700

    Improved keystone error handling in syspanel.

      * Added "AuthorizationFailure" to the recoverable errors list
        since keystoneclient raises it anytime it can't talk to
        keystone. Fixes bug 971249.

      * Used proper exception handling for the users index view.
        Fixed some tests that had been failiing but masked previously.
        Fixes bug 971250.

    Change-Id: Iec8c1fc7bf8585a529fa15af55f807abc0f84d42